Lesson Notes By Weeks and Term v4 - JHS 3

Lesson Video

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Performance objectives

• Describe at least three different mechanisms.
• Explain how these mechanisms function.
• Identify common materials used in construction.
• Create a simple diagram of a mechanism.
• Collaborate to discuss and improve mechanisms.

Lesson summary

This lesson introduces the fascinating world of mechanisms – the clever systems of moving parts that make our work easier and our machines function. From the simple pliers an electrician uses to the complex gears in a corn mill, mechanisms are all around us in Ghana. Understanding how they work is the first step to being able to design, build, and repair our own tools and projects. By learning to describe these systems, we empower ourselves to become innovators and problem-solvers in our communities. This lesson will focus on identifying common mechanisms and explaining their roles in creating products and constructing projects.

Lesson notes

A. What is a Mechanism?

A mechanism is a system of parts or components that work together to transfer or change motion and force to perform a specific task. Think of it as the "engine room" of a tool or machine.

Every mechanism has three main parts: Input: Where energy or force is applied (e.g., turning a handle). Process: The mechanism itself, which changes the direction, speed, or type of motion. Output: The final action or work done (e.g., a drill bit spinning, a load being lifted).

Example: In a hand-cranked eggbeater, the input is you turning the handle. The process is the gear system inside. The output is the fast rotation of the beaters. B. Types of Simple Mechanisms

Evaluation guide

• B9.4.1.1
• Demonstrate
• understanding of
• applications of